Computer-supported collaboration

Computer-supported collaboration

Computer-supported collaboration (CSC) research focuses on technology that affects groups, organizations, communities and societies, e.g., voice mail and text chat. It grew from cooperative work study of supporting people's work activities and working relationships. As net technology increasingly supported a wide range of recreational and social activities, consumer markets expanded the user base, enabling more and more people to connect online to create what researchers have called a computer supported cooperative work, which includes "all contexts in which technology is used to mediate human activities such as communication, coordination, cooperation, competition, entertainment, games, art, and music" (from CSCW 2004).


Scope of the field

Focused on output

The subfield computer-mediated communication deals specifically with how humans use "computers" (or digital media) to form, support and maintain relationships with others (social uses), regulate information flow (instructional uses), and make decisions (including major financial and political ones). It does not focus on common work products or other "collaboration" but rather on "meeting" itself, and on trust. By contrast, CSC is focused on the output from, rather than the character or emotional consequences of, meetings or relationships, reflecting the difference between "communication" and "collaboration".

Focused on contracts and rendezvous

Unlike communication research, which focuses on trust, or computer science, which focuses on truth and logic, CSC focuses on cooperation and collaboration and decision making theory, which are more concerned with rendezvous and contract. For instance, auctions and market systems, which rely on bid and ask relationships, are studied as part of CSC but not usually as part of communication.

The term CSC emerged in the 1990s to replace the following terms:

  • workgroup computing, which emphasizes technology over the work being supported and seems to restrict inquiry to small organizational units.
  • groupware, which became a commercial buzzword and was used to describe popular commercial products such as Lotus Notes. Check here for a comprehensive literature review.
  • computer supported cooperative work, which is the name of a conference and which seems only to address research into experimental systems and the nature of workplaces and organizations doing "work", as opposed, say, to play or war.

Collaboration is not software

Two different types of software are sometimes differentiated:

Base technologies such as netnews, email, chat and wiki could be described as either "social" or "collaborative". Those who say "social" seem to focus on so-called "virtual community" while those who say "collaborative" seem to be more concerned with content management and the actual output. While software may be designed to achieve closer social ties or specific deliverables, it is hard to support collaboration without also enabling relationships to form, and hard to support a social interaction without some kind of shared co-authored works.

May include games

Accordingly, the differentiation between social and collaborative software may also be stated as that between "play" and "work". Some theorists hold that a play ethic should apply, and that work must become more game-like or play-like in order to make using computers a more comfortable experience. The study of MUDs and MMRPGs in the 1980s and 1990s led many to this conclusion, which is now not controversial.

True multi-player computer games can be considered a simple form of collaboration, but only a few theorists include this as part of CSC.

Not just about "computing"

The term social computing is used mostly at IBM to describe the field, in an attempt to invoke existing social conventions or contexts as opposed to technological attributes: the use of e-mail for maintaining social relationships, instant messaging for daily microcoordination at one's workplace, or weblogs as a community building tool. Most researchers argue that these are all forms of collaboration, not forms of "computing", making this variant term an oxymoron: whatever is "social" about software, it is not the "computing" aspect. The term has not caught on much beyond IBM.

However, the relatively new areas of evolutionary computing, massively parallel algorithms, and even "artificial life" explore the solution of problems by the evolving interaction of large numbers of small actors, or agents, or decision-makers who interact in a largely unconstrained fashion. The "side effect" of the interaction may be a solution of interest, such as a new sorting algorithm; or there may be a permanent residual of the interaction, such as the setting of weights in a neural network that has now been "tuned" or "trained" to repeatedly solve a specific problem, such as making a decision about granting credit to a person, or distinguishing a diseased plant from a healthy one. Connectionism is a study of systems in which the learning is stored in the linkages, or connections, not in what is normally thought of as content.

This larger definition of "computing", in which not just the data, or the metadata, or the context of the data, but the computer itself is being "processed", makes the term "social computing" have a whole different meaning. The repeated use of the "blogosphere" to process daily news has a "side effect" of building up linkage maps, trusted sources, RSS aggregator feeds, etc., so that the overall system is, in some sense, learning how to do something better, more rapidly, and more easily.

In control systems theory, it has been shown that closed-loop feedback systems are vastly more robust than open-loop system. The blogosphere has been criticized for having "echos" or repeatedly cycling certain ideas, but the upside is that there are simultaneous closed-loop feedback paths across a wide spectrum of distance and time-constants. These issues of computability and algorithm-order are classic computer-science issues and, in that sense, social computing is again a legitimate "computing" subject, even if it involves flexible collaboration as part of the "hardware". An analogy might be to imagine a "computer" built entirely of field-programmable gate-arrays, where not just the data and the program itself can be modified in flight (as in LISP, where programs and data are indistinguishable), but the hardware and logic and rules of operation also can be modified real-time during a "computation".

If the collaboration is over a large distance and many time-zones, the system will probably encounter significant differences in context between the components, resulting in a whole new set of design and support problems and behaviors, especially misunderstanding of what is taken as implicit or obvious by different collaborators, and therefore not explicitly stated. Such differences may be cultural, geographic, hierarchical, etc. For example, when Hurricane Katrina hit the U.S. in Fall, 2005, there were substantial collaboration and communication difficulties between Federal, State, and local officials. A significant portion of those difficulties were classic issues that very frequently result from attempts to collaborate over a distance, and from people at one level in an organization trying to collaborate with people at an entirely different level of an organization, with each group having different meanings to what "the problem" is that is being addressed and what time-scale is relevant. Computer-supported collaboration research includes academic research into how to minimize, or at least recognize that class of problem in collaboration and take it into account. Similar problems may occur if a conversation or collaboration occurs when it is a work day at one site or in one country, and already a week-end or holiday in another site, and the parties have different levels of stress and focus. These problems are analogies to "flame wars", the abrupt hostility that has been observed to occur when e-mail is used for a conversation, when the parties are no longer getting direct feedback from watching each other's body language.

A final difference between computer-supported collaboration and classic "computing" is that a computer typically remains a closed system, focusing only on what is already "inside the box", and only dealing with it in an abstract or mental fashion. Collaboration that occurs over a significant period of space and time shares properties of "active vision", where the actions possible are more than just analyzing an incoming TV image of an object of interest, but include walking over to the object, picking it up, turning it over, smashing it open, etc. The collaborating "units" are human beings, typically, who remain partly involved in the collaboration, and partly both sensing and actively changing the world around them. A collaborative discussion of baking cookies could include a period in which participants left the room to actually bake such cookies and try them out. A collaborative discussion of politics could include actually voting and changing the political landscape. This inclusion of both active sensors and active "effectors" is again a difference from "computing" that, at a minimum, makes this field at least as complex as "robotics".

Also, as stated earlier, generally a computer is unaltered by the program it is running or the data it is processing, but a collaboration of people and groups is typically substantially and permanently altered by the nature of problems it works on, the enjoyment or frustration with the working process, and the outcome of the work. This lasting residual "side effect" or "effect" of one "cycle" of the collaboration then may alter the way in which the collaboration tool is use for the next "cycle", as people learn how to use this new method, so short-term, single-session or single-problem studies of collaboration tools may be very misleading as to what the longer-term outcomes may be. Imagine that your desktop computer, after a while, decided it didn't really like to do word-processing any more and preferred to work on addition, and that every time you tried to write e-mail the computer stopped mid-course to become obsessed with doing word-counts. Analogous behaviors in CSC, as with "game-theory", make studying almost any system or design problem frustratingly complicated: either the problems involved seem to be "toy" problems that are doable but unrealistically simple, or the problems become so complex that analysis is impossible.

A "computer" doesn't generally care whether the answer to a problem is "5" or "25", "yes" or "no," but humans involved in a group decision-making process may care very much about the outcome, and the various answers can have winners and losers with potentially very high stakes. At a minimum, this introduces substantial bias into the analysis of any data, as people will tend to selectively see facts that support the conclusions they personally prefer. In a collaboration within a single hospital between multiple clinicians, mediated by an "electronic medical record", there may actually be a substantial amount of dispute and negotiation going on among, say, a group focusing on treating diabetes and another group focusing on treating congestive heart failure. The "collaboration" may actually be much more of a "competition" to frame and define the problem in terms that result in favorable outcomes. Again, this makes CSC design work far more complicated than simply trying to get a group of sensors or computers to share data and work together correctly. In fact, in some cases, participants may have a strong vested interest in the status quo and prefer as an outcome that the "problem" not be solved. A successful CSC system, in their minds, would be one that prevented the solution of the problem supposedly being addressed collaboratively, perhaps while giving a misleading appearance of cooperative effort. This factor complicates research into whether a CSC system is well-designed or not.

For example, in some countries national political elections could be viewed, abstractly, as heavily technology-mediated (and "computer supported") processes, including information distribution, discussion, debate, and an outcome resolution process - yet there may not be a unanimous opinion as to whether this process "works" or "is broken." It is difficult to improve or redesign a system if people can't even agree on whether the system works now or not. The implications of this is that CSC systems are inextricably embedded in social contexts and have to simultaneously address a specific problem, plus the issue of whether collaboration this way increases the ability to address future problems, plus the issue of what really defines which problems need to be addressed in the first place and the relative priority of those problems.

And, not only is there difference and potential competition between parties across organizational and cultural and geographic dimensions—opinions on all those subjects may differ, and generally will differ, even within any given organization at different hierarchical levels. What works for workers may not work for management. What works for middle-management may not work for upper-management. What works for management may not work for the stockholders. What works for the company may not work for the country. A CSC system has to handle not just "content processing" but also "context processing" in that sense, sorting out the different nested and overlapping value-laden reference frames as well as the data and "the explicitly identified problem" within those reference frames. Part of this is a very abstract technical problem, faced by researchers in distributed artificial intelligence, in getting, say, 20 different surveillance robotic vehicles to talk to each other and compare notes - which is in itself a hard problem. Add to that complexity a new factor that, say, each of the robots has a hidden agenda and is not being totally honest about what it shares.

If the preceding discussion gives the impression that CSC problems are extraordinarily hard to solve, that's correct. In fact, they have been described as "wicked" problems, not only because they are immensely complicated when addressed, but because they look so simple from the outside and are generally under-appreciated. For example, building a disaster-response communication system is vastly more complex than just getting a unified frequency for different agencies to use to communicate with each other, because the words, meanings, contexts, values, and agendas all also have to be communicated and resolved, across space, across time, and across a 14-level hierarchy from the national leader to the front-line responder.

The view of a scene from an infection-control specialist's viewpoint and from a military or police viewpoint may suggest exactly opposite actions regarding "rounding up people and concentrating them at the stadium." The ability of a CSC system to facilitate wise decisions and action in that sort of situation might require the type of action described by the Harvard Negotiation Project in the book "Getting to Yes", where "positions" have to be abstracted to "interests", perhaps repeatedly, until a level is reached at which agreement and a common ground can be found between groups that appear, on the surface, to be hopelessly deadlocked. It is an open research question as to what features of a CSC system could simply allow that type of discussion to occur, let alone facilitate it. Very high bandwidth and multiple "back-channel" communication pathways have often proven to be helpful. Apparently very simple things, such as sufficient magnification and resolution on video screens to be able to actually see another person's eyes clearly, can have a dramatic effect on the ability of a system to support trust-building and collaboration at a distance.

Requires protocols

Communication essential to the collaboration, or disruptive of it, is studied in CSC proper. It is somehow hard to find or draw a line between a well-defined process and general human communications.

Reflecting desired organization protocols and business processes and governance norms directly, so that regulated communication (the collaboration) can be told apart from free-form interactions, is important to collaboration research, if only to know where to stop the study of work and start the study of people. The subfield CMC or computer-mediated communication deals with human relationships.

Basic tasks

Tasks undertaken in this field resemble those of any social science, but with a special focus on systems integration and groups:[1]

  • Discover the multidisciplinary nature of computer supported cooperative work
  • Discuss experiences with technologies that support communication, collaboration, and coordination
  • Understand behavioral, social, and organizational challenges to developing and using these technologies
  • Learn successful development and usage approaches
  • Anticipate future trends in technology use and global social impacts
  • Analyze CMC systems and interaction via social software
  • Design CMC systems to facilitate desirable outcomes
  • Apply CMC analysis and visualization tools
  • Find uses of video conferencing, if any
  • Apply social ergonomics
  • Work environment design and A/V considerations
  • Improve audio and video encoding - from grainy thumbnails to HD
  • Improve and integrate common video conferencing tools
  • Analyze work processes, e.g. with the support of video monitoring
  • Deploy and evaluate systems for use in particular work contexts
  • Take theoretical perspectives to fieldwork, dealing with social complexity.
  • Performing observational studies
  • Work in commercial and industrial settings, domestic environments and public spaces

Problems of method, communication and comprehension in collaborations between ethnographer and system developer are also of special concern.

A 2004 list of "coordination and communication technologies" included:

"Innovations and experiences with Intranets, the Internet, WWW"
"Innovative installations: CSCW and the arts"
"Innovative technologies and architectures to support group activity, awareness and telepresence"
"Social and organizational effects of introducing technologies"
"Theoretical aspects of coordination and communication"
"Methodologies and tools for design and analysis of collaborative practices", e.g. social network analysis
"Ethnographic and case studies of work practice"
"Working with and through collections of heterogeneous technologies"
"Emerging issues for global systems"

Plenary addresses on Open Source Society' and Hacking Law suggest a bold, civilization-building, ambition for this research.

Less ambitiously, specific CSC fields are often studied under their own names with no reference to the more general field of study, focusing instead on the technology with only minimal attention to the collaboration implied, e.g. video games, videoconferences. Since some specialized devices exist for games or conferences that do not include all of the usual boot image capabilities of a true "computer", studying these separately may be justified. There is also separate study of e-learning, e-government, e-democracy and telemedicine. The subfield telework also often stands alone.


Early research

The development of this field reaches back to the late 1960s and the visionary assertions of Ted Nelson, Douglas Engelbart, Alan Kay, Glenn Gould, Nicholas Negroponte and others who saw a potential for digital media to ultimately redefine how we work. A very early thinker, Vannevar Bush, even suggested in 1945 As We May Think.


The inventor of the computer "mouse", Douglas Engelbart, studied collaborative software (especially revision control in computer-aided software engineering and the way a graphic user interface could enable interpersonal communication) in the 1960s. Alan Kay worked on Smalltalk, which embodied these principles, in the 1970s, and by the 1980s it was well regarded and considered to represent the future of user interfaces.

However, at this time, collaboration capabilities were limited. As few computers had even local area networks, and processors were slow and expensive, the idea of using them simply to accelerate and "augment" human communication was eccentric in many situations. Computers processed numbers, not text, and the collaboration was in general devoted only to better and more accurate handling of numbers.


This began to change in the 1980s with the rise of personal computers, modems and more general use of the Internet for non-academic purposes. People were clearly collaborating online with all sorts of motives, but using a small suite of tools (LISTSERV, netnews, IRC, MUD) to support all of those motives. Research at this time focused on textual communication, as there was little or no exchange of audio and video representations. Some researchers, such as Brenda Laurel, emphasized how similar online dialogue was to a play, and applied Aristotle's model of drama to their analysis of computers for collaboration.

Another major focus was hypertext—in its pre-HTML, pre-WWW form, focused more on links and semantic web applications than on graphics. Such systems as Superbook, NoteCards, KMS and the much simpler HyperTies and HyperCard were early examples of collaborative software used for e-learning.


In the 1990s, the rise of broadband networks and the dotcom boom presented the Internet as mass media to a whole generation. By the late 1990s, VoIP and net phones and audio chat had emerged. For the first time, people used computers primarily as communications, not "computing" devices. This, however, had long been anticipated, predicted, and studied by experts in the field.

Video collaboration is not usually studied. Online videoconferencing and webcams have been studied in small scale use for decades but since people simply do not have built-in facilities to create video together directly, they are properly a communication, not collaboration, concern.

ACM conferences

The Computer Supported Cooperative Work conferences are held by the Association for Computing Machinery Special Interest Group in Computer-Human Interaction biannually in the fall since 1984. The most recent conference was in 2008. Starting with the next conference in 2010, CSCW becomes an annual event held in February. In the beginning, the conferences were small affairs focused on such specific applications as hypertext—which soon got its own conference.

The conference series began when, according to Jonathan Grudin: "Paul Cashman and Irene Greif organized a workshop of people from various disciplines who shared an interest in how people work, with an eye to understanding how technology could support them. They coined the term computer-supported cooperative work to describe this common interest... thousands of researchers and developers have been drawn to it."

According to Grudin, "an earlier approach to group support, Office Automation, had run out of steam. The problems were not primarily technical, although technical challenges certainly existed. The key problem was understanding system requirements. In the mid-1960s, tasks such as filling seats on airplane flights or printing payroll checks had been translated into requirements that resulted (with some trial and error) in successful mainframe systems. In the mid-1970s, minicomputers promised to support groups and organizations in more sophisticated, interactive ways: Office Automation was born. Single-user applications such as word processors and spreadsheets succeeded; office automation tried to integrate and extend these successes to support groups and departments. But what were the precise requirements for such systems?"


Other pioneers in the field included Ted Nelson, Austin Henderson, Kjeld Schmidt, Lucy Suchman, Sara Bly, Randy Farmer, and many "economists, social psychologists, anthropologists, organizational theorists, educators, and anyone else who can shed light on group activity." - Grudin.

Politics and business

In this century, the focus has shifted to sociology, political science, management science and other business disciplines. This reflects the use of the net in politics and business and even other high-stakes collaboration situations, such as war.


Though it is not studied at the ACM conferences, military use of collaborative software has been a very major impetus of work on maps and data fusion, used in military intelligence. A number of conferences and journals are concerned primarily with the military use of digital media and the security implications thereof.

Current research

Current research in computer-supported collaboration includes:

Voice command

"Computer..." - spoken often on every Star Trek episode

Early researchers, such as Bill Buxton, had focused on non-voice gestures (like humming or whistling) as a way to communicate with the machine while not interfering too directly with speech directed at a person. Some researchers believed voice as command interfaces were bad for this reason, because they encouraged speaking as if to a "slave". A notable innovation was the emergence of the video prototype - Apple Computer used it to test the likely user acceptance of a voice interface. They had very mixed results, and decided not to pursue such an interface at the time (late 1980s).

Link semantics

What's a "link"? What am I saying when I link something, or remove a link to something? Is there one taxonomy of all types of links? Is there one per industry? Per profession? Per culture?

Since the 1960s, researchers had been insisting that links should have types—that, for instance, a link that "contradicts" another should be easy to differentiate from one that "supports" another: all of the early hypertext systems had schemes for doing exactly this, somehow.

HTML supports simple link types with the REL tag and REV tag. Some standards for using these on the WWW were proposed, most notably in 1994, by people very familiar with earlier work in SGML. However, no such scheme has ever been adopted by a large number of web users, and the "semantic web" remains unrealized. Heroic attempts such as have sometimes collapsed totally.

A lot of CSC researchers ask why, and why the interest in applying a semantic web standard should continue despite so many failed attempts.

Identity and privacy

Who am I, online? Can an account be assumed to be the same as a person's real-life identity? Should I have rights to continue any relationship I start through a service, even if I'm not using it any longer? Who owns information about the user? What about others (not the user) who are affected by information revealed or learned by me?

Online identity and privacy concerns, especially identity theft, have grown to dominate the CSCW agenda in more recent years. The separate Computers, Freedom and Privacy conferences deal with larger social questions, but basic concerns that apply to systems and work process design tend still to be discussed as part of CSC research.

Online decision making

Where decisions are made based exclusively or mostly on information received or exchanged online, how do people rendezvous to signal their trust in it, and willingness to make major decisions on it?

Team consensus decision making in software engineering, and the role of revision control, revert, reputation and other functions, has always been a major focus of CSC: There is no software without someone writing it. Presumably, those who do write it must understand something about collaboration in their own team. This design and code, however, is only one form of collaborative content.

Collaborative content

What are the most efficient and effective ways to share information? Can creative networks form through online meeting/work systems? Can people have equal power relationships in building content?

By the late 1990s, with the rise of wikis (a simple repository and data dictionary that was easy for the public to use), the way consensus applied to joint editing, meeting agendas and so on had become a major concern. Different wikis adopted different social and pseudopolitical structures to combat the problems caused by conflicting points of view and differing opinions on content.


A report on collaboratories, prepared under the auspices of the National Research Council, described a collaboratory as a . . . center without walls in which the nation's researchers can perform research without regard to geographical location—interacting with colleagues, accessing instrumentation, sharing data and computational resources, and accessing information from digital libraries.

Tools and techniques for designing and running effective "collaboratories" among researchers with similar interests and a common language have been developed over the last 20 years and are well documented in the literature. Much of this hard-won knowledge regards process as much as it does technology.

In Datacloud: Toward a New Theory of Online Work, Johndan Johnson-Eilola describes a specific computer-supported collaboriatin space: The Smart Board. According to Johnson-Eilola, a “Smart Board system provides a 72-inch, rear projection, touchscreen, intelligent whiteboard surface for work” (79). In Datacloud, Johnson-Eilola asserts that “[w]e are attempting to understand how users move within information spaces, how users can exist within information spaces rather than merely gaze at them, and how information spaces must be shared with others rather than being private, lived within rather than simply visited” (82). He explains how the Smart Board system offers an information space that allows his students to engage in active collaboration. He makes three distinct claims regarding the functionality of the technology: 1) The Smart Board allows users to work with large amounts of information, 2) It offers an information space that invites active collaboration, 3) The work produced is often “dynamic and contingent” (82).[2]

Johnson-Eilola further explains that with the Smart Board “…information work becom[es] a bodied experience” (81). Users have the opportunity to engage with—inhabit—the technology by direct manipulation. Moreover, this space allows for more than one user; essentially, it invites multiple users.[2]


How can work be made simpler, less prone to error, easier to learn? What role do diagrams and notations play in improving work output? What words do workers come to work already understanding, what do they misunderstand, and how can we get them using the same words to mean the same thing?

Study of content management, enterprise taxonomy and the other core instructional capital of the learning organization has become increasingly important due to ISO standards and the use of continuous improvement methods. Natural language and application commands tend to converge over time, becoming reflexive user interfaces. A concern that overlaps with OOPSLA.

Telework and human capital management

Where are the workers? Do we care? How do we coordinate them? How do we hire them, fire them, help them find the right thing to do next?

The role of social network analysis and outsourcing services like e-lance, especially when combined in services like LinkedIn, is of particular concern in human capital management—again, especially in the software industry, where it is becoming more and more normal to run 24x7 globally distributed shops.

Major applications

Applications that imply certain kinds of collaboration include:

  • electronic meeting rooms or other live group support systems
  • desktop conferencing and videoconferencing systems,
  • large public wikis employing collaborative authorship
  • weblogs ("blogs") as small-group collaboration tools, along with e-mail, text-chat
  • SMS messaging, audio and video chat, audio and video "podcasting"
  • the "blogosphere" - weblogs as large-scale collaboration tools
  • web-broadcast syndication tools (RSS and Atom)
  • web-broadcast aggregation tools (automated notification, clipping services, filtering, weighting)

Related fields

Related fields are collaborative product development, CAD/CAM, computer-aided software engineering (CASE), concurrent engineering, workflow management, distance learning, telemedicine, medical CSCW and the real-time network conferences called MUDs (after "multi-user dungeons," although they are now used for more than game-playing).

See also


  1. ^ CSCW 2004 tutorials
  2. ^ a b Johnson-Eilola, Johndan. Datacloud: Toward a New Theory of Online Work. Cresskill, NJ: Hampton Press, Inc., 2005. Print.

External links

  • - Collaboration & technology - help contribute to a free collaborative encycolopedia on collaboration.
  • SPARC - Space Physics and Aeronomy Research Collaboratory.
  • Science Of Collaboratories - Science of Collaboratories Project Home, with links to over 100 specific collaboratories
  • Paul Resnick - Professor Paul Resnick's home page ( papers on SocioTechnical Capital, reputation systems, ride share coordination services, recommender systems, collaborative filtering, social filtering).
  • Reticula - Weblogs, Wikis, and Public Health Today. News, professional activities, and academic research.
  • Fifteen Charlie - A weblog about the policy discipline of emergency preparedness and response. (This is just one example of a massive, multi-level, dynamic, ad hoc, politicized, life-and-death, computer-supported coordination and collaboration task. Question: What changes to the computing infrastructure might make this work better?).
  • US National Health Information Network News about and links into the US NHIN and efforts to build a nationwide virtual Electronic Health Record to support and facilitate electronic collaboration between clinicians, hospitals, patients, social work, and public health.
  • Political Blogosphere - The Political Blogosphere and the 2004 U.S. Election: Divided They Blog, Adamic L. and Glance N., HP Labs, 2005. ("In this paper, we study the linking patterns and discussion topics of political bloggers. Our aim is to measure the degree of interaction between liberal and conservative blogs, and to uncover any differences in the structure of the two communities.")
  • [1] - CSCW and Groupware Literature Guide: Randy's Reviews, Recommendations, and (Optional) Referrals.

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